1 files changed, 62 insertions, 0 deletions
diff --git a/test/Transforms/InstSimplify/2010-12-20-Distribute.ll b/test/Transforms/InstSimplify/2010-12-20-Distribute.ll
new file mode 100644
index 0000000..d20abd6
--- /dev/null
+++ b/test/Transforms/InstSimplify/2010-12-20-Distribute.ll
@@ -0,0 +1,62 @@
+; RUN: opt < %s -instsimplify -S | FileCheck %s
+
+define i32 @factorize(i32 %x, i32 %y) {
+; CHECK: @factorize
+; (X | 1) & (X | 2) -> X | (1 & 2) -> X
+  %l = or i32 %x, 1
+  %r = or i32 %x, 2
+  %z = and i32 %l, %r
+  ret i32 %z
+; CHECK: ret i32 %x
+}
+
+define i32 @factorize2(i32 %x) {
+; CHECK: @factorize2
+; 3*X - 2*X -> X
+  %l = mul i32 3, %x
+  %r = mul i32 2, %x
+  %z = sub i32 %l, %r
+  ret i32 %z
+; CHECK: ret i32 %x
+}
+
+define i32 @factorize3(i32 %x, i32 %a, i32 %b) {
+; CHECK: @factorize3
+; (X | (A|B)) & (X | B) -> X | ((A|B) & B) -> X | B
+  %aORb = or i32 %a, %b
+  %l = or i32 %x, %aORb
+  %r = or i32 %x, %b
+  %z = and i32 %l, %r
+  ret i32 %z
+; CHECK: ret i32 %r
+}
+
+define i32 @factorize4(i32 %x, i32 %y) {
+; CHECK: @factorize4
+  %sh = shl i32 %y, 1
+  %ml = mul i32 %sh, %x
+  %mr = mul i32 %x, %y
+  %s = sub i32 %ml, %mr
+  ret i32 %s
+; CHECK: ret i32 %mr
+}
+
+define i32 @factorize5(i32 %x, i32 %y) {
+; CHECK: @factorize5
+  %sh = mul i32 %y, 2
+  %ml = mul i32 %sh, %x
+  %mr = mul i32 %x, %y
+  %s = sub i32 %ml, %mr
+  ret i32 %s
+; CHECK: ret i32 %mr
+}
+
+define i32 @expand(i32 %x) {
+; CHECK: @expand
+; ((X & 1) | 2) & 1 -> ((X & 1) & 1) | (2 & 1) -> (X & 1) | 0 -> X & 1
+  %a = and i32 %x, 1
+  %b = or i32 %a, 2
+  %c = and i32 %b, 1
+  ret i32 %c
+; CHECK: ret i32 %a
+}